Mechanisms of LiF Interlayer Enhancements of Perovskite Light-Emitting Diodes.
J Phys Chem Lett
; 11(10): 4213-4220, 2020 May 21.
Article
em En
| MEDLINE
| ID: mdl-32374611
ABSTRACT
The use of LiF as a thin interlayer between the electron transport layer and cathode has played a pivotal role in remarkable advances in perovskite LEDs (PeLEDs); however, the mechanism behind the effect of LiF remains to be fully understood. Here, we report a combined experimental and computational study, from which we ascribe the benefits of a LiF interlayer to the migration of dissociated Li into the cathode and dissociated F into the anode. Electronic device simulations reveal that the former improves electron injection by lowering the Schottky barrier height, while the latter reduces the barrier width. These reduce turn-on voltage and improve current density and charge balance in LEDs. We fabricate PeLEDs with and without the LiF interlayer and link these materials and electronic phenomena to the device light-current-voltage characteristics. X-ray photoelectron spectroscopy obtained in sputter profiling of PeLEDs corroborates the dissociation of LiF.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2020
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Article